0 like 0 dislike
519 views
by

I have a 2003 Chevy Silverado 1500 4x4 with the 4.8 liter engine and automatic. I ran a tank of 92 octane gas through it and the check engine light came in. It is indicating a PO455 code. The only performance issue I have found is that the valves rattle a little when the engine is cold when first accelerating. Any ideas?

Vehicle: 2003 Chevy Silverado 1500 4x4

1 Answer

0 like 0 dislike
by
the first thing to do for a P0455 is to try to replace your gas cap, with an OEM Chevy gas cap.

and about the rattling issue, try to use a different brand of oil. Pennzoil Ultra will give you great cold start protection

Related questions

0 like 0 dislike
1 answer 323 views
asked Oct 16, 2018 by Duke
0 like 0 dislike
1 answer 1.6k views
0 like 0 dislike
1 answer 248 views
asked Aug 24, 2018 by anonymous
0 like 0 dislike
1 answer 233 views
asked Aug 19, 2018 by Michael Reed
0 like 0 dislike
1 answer 318 views
asked May 24, 2018 by anonymous

36.2k questions

32.2k answers

1.3k comments

22.8k users

Need A Repair Shop?
Find local automotive repair shops in your area.
Does your car have Safety Recalls? → Check here
...